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ACE

Staff Counsel

Prior to joining PEER, Colleen was an Assistant District Attorney for the Suffolk County District Attorney’s Office in New York. She has also worked, clerked, and interned for multiple government agencies and non-profits, including the United States Department of Justice, the Office of the New York State Attorney General, the Natural Resources Defense Council, and Defenders of Wildlife. Colleen also volunteered as a Park Interpreter with the National Park Service at Theodore Roosevelt Island in Washington, DC. Colleen received her law degree from Georgetown University Law Center, where she was the Vice President of the Environmental Law Society and Senior Notes Editor for the Georgetown Journal of Gender and the Law. She received her bachelor’s degree summa cum laude in International Affairs from The George Washington University’s Elliott School of International Affairs. Colleen enjoys backpacking and camping trips, playing board games, and reading mystery novels.

COMMENTARY | Anonymous Activism and Whistleblowing in the Age of Trump

by Colleen Zimmerman | January 24, 2025
PEER anticipates a flood of requests for our legal services during Trump 2.0. Here's an overview of our approach to anonymous activism and whistleblowing ...

EPA Intervention Needed to Save Virginia Wetlands

by PEER | August 21, 2014
Corps Botches Wetland Delineation; Okays Hundreds of Wetland Acres for Fill ...

Feds Plan Massive Cormorant Slaughter at Mouth of Columbia

by PEER | June 13, 2014
Unprecedented Killing of Thousands of Double-Crested Cormorants on Sand Island ...

Loss of Streams and Wetlands Will Widen With New Corps Rules

by PEER | April 18, 2011
Green Power Encouraged to Leave Brown Footprints under New Exemptions ...

Big Wetlands Losses Plotted for Green Power

by PEER | November 9, 2010
Corps Prepares Broad Exemptions for Solar, Wind, Geothermal & Tidal Facilities ...